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Nurse Liang Shanbo (Carol 'Do Do' Cheng) and Actress Zhu Yingtai (Maggie Cheung) are mismatched cousins who just inherited a rental home from their late relative. When they moved in, they discover that a room has been rented out to a man named Ben, who turns out to be a criminal gangster. One night, when Ben returns home, bloodied and injured, he collapses into Yingtai's arms and whispers a code in her ear before he dies. Not knowing what the code leads to, Yingtai and Shanbo are later visited by a man claiming to be Ben's brother who wants to solve the case. In the meantime, gangsters believed to be involved with Ben's murder want to retrieve the code from the girls, whom they think were told by Ben what it actually unlocks.

How to Watch Double Causes Trouble Legally and Safely

If you want to stream Double Causes Trouble through reputable and legal services, there are a few good options depending on where you are. Subscription platforms like HBO Max, Disney+, Netflix, Amazon Prime Video, and Apple TV+ sometimes carry Double Causes Trouble films or related DC titles—though availability depends on your country.

If you’d rather not commit to a subscription, there are ad‑supported, free (but legal) platforms such as Tubi, Pluto TV, Peacock or Crackle (where available in your region) that occasionally host superhero films.

Lastly, don’t forget about library‑linked streaming options like Kanopy or Hoopla (if your library or university is registered), and official uploads by film distributors on YouTube—these can also give you legal access to classic movies.